Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1993-03-01
1994-11-15
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
524611, 524706, 524742, 524151, 528196, 528502, C08G 6400
Patent
active
053649265
ABSTRACT:
Object: The present invention was conceived in light of the above-described prior art. The object of this invention is to provide a method for preparing optical-grade polycarbonate compositions, which method is able to prepare with good productivity optical-grade polycarbonate compositions that have not only excellent clarity and water resistance, but also excellent retention stability such as heat stability and hue stability when molten and a low content of inclusions and impurities, and that undergo little heat deterioration.
Constitution: The method for preparing optical-grade polycarbonate compositions according to this invention, which method comprises the melt-polycondensation of an aromatic dihydroxy compound and a diester carbonate in the presence of a catalyst, followed by the addition of additives [B] while the polycarbonate [A] obtained as the reaction product is in a molten state, and mixing.
In this invention, it is preferable to prepare the optical-grade polycarbonate composition by filtration with a polymer filter following mixing.
REFERENCES:
patent: 5026817 (1991-06-01), Sakashita et al.
patent: 5214072 (1993-05-01), Fennhoff et al.
Database WPI--Week 8736, Derwent Publications Ltd., London, BG; AN 87-252422 & JP-A-62 172 019 *abstract* (Jul. 29, 1987).
Database WPI--Week 9309, Derwent Publications Ltd., London, BG; AN 93-071176 & JP-A-5 017 564 (Jan. 26, 1993).
Database WPI--Week 873, Derwent Publications ltd, London BG; AN 87-302901 & JP-A-62 212 427 (Sep. 18, 1993).
Kanezawa Akio
Miura Kimiyoshi
Sakashita Takeshi
Shimoda Tomoaki
Tominari Kenichi
GE Plastics, Japan, Ltd. (GEP)
Kight III John
Mosley Terressa M.
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